回复:TN 还是 H1 ? 请大家指教, 多谢 !

Sounds like you will have more headache with J1 waiver. You must either get a waiver from China or go back to China for 2 years(?). The time you stayed in Canada doesn't count.
SSN should be the same. And it is linked to your J1. SSN application form requires you disclose your previous SSN anyway.

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